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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 26 Aug 2014 07:40:25 +0200
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Subject: Re: [Qemu-devel] Bug#758881: [bisected] VNC server can't get all
 sent chars correctly
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To: Marc <sibson@gmail.com>
Cc: Michael Tokarev <mjt@tls.msk.ru>, 758881@bugs.debian.org, qemu-devel <qemu-devel@nongnu.org>, Gonglei <arei.gonglei@huawei.com>, Gabriele Giacone <1o5g4r8o@gmail.com>, Marc Sibson <sibson+vncdotool@gmail.com>

On Mo, 2014-08-25 at 21:11 -0700, Marc wrote:
> Hi,
>=20
>=20
> On August 25, 2014 at 3:40:01 AM, Gabriele Giacone
> (1o5g4r8o@gmail.com) wrote:
> >=20
> > > IMO vncdotool should be fixed to add small delays between
> > keyboard=20
> > > events, as if a real person is typing, instead of sending the key
> > events=20
> > > at the maximum possible speed.=20
> vncdotool does have a =E2=80=94delay=3DMILLISECONDS switch that inserts=
 a delay
> between commands.  Currently, the two behaviours causing trouble seem
> to be that delay defaults to 0 and "type insecure=E2=80=9D is considere=
d one
> command, so there is  no delay between key presses :( =20
>=20
> Is there a non-zero value for =E2=80=94delay that makes sense?  I=E2=80=
=99m somewhat
> hesitant to change =E2=80=94delay  as it would be a behavioural change =
for
> other users, but if the value is sufficiently small it could be a net
> usability gain.
>=20
> Are you requesting that the type command be fixed to insert delays
> after every character or that default for =E2=80=94delay should be non-=
zero?

There should be a delay after every character.  It can be pretty small.
10ms should be enough (you should set TCP_NODELAY though to make sure
the key events are not buffered in the network stack).

I guess it makes sense to decouple that from the delay between commands
as the time a qemu guest needs to process a command can be much higher
than the time it needs to process a key event.

cheers,
  Gerd